On Someone's Birthday!
What Normal People Do - "I'll text them at 12:00 AM. So it's the first happy birthday they get :D"
What I Do - "I'll text them at 11:59 PM (1 minute before the day after their birthday). So then, all day they think 'Oh no! He forgot my birthday.' And at the last second when they get my message, it's like "haha, guess again, I actually remembered."